Threading machine



Feb. 5 1 924;

- E. H-. WYILSON .THREADING MACHINE Filed Jan. '21. 1921 4 Sheets-Sheet 1 INVENTOR.

E. H. WILSON THREADING MACHINE 4 Sheets-Sheet 2 Filed Jan. 21 1921 E. H. WILSON THREADING MACHINE Filed Jan. 21. 1921 '4 Sheets-Sheet 5 I g I I F g 5 II I 'l A zlll l u 4 4 3 4 4 Z v w ll 0 6 6 I 4 :1 4 I 4 7 1 v XII v J wd 0 5 H 4 I 44 W m w 0 A \qF Z II" p w r c i -I n EDGAR H. "WILSON, OF CHAETIEES TOWNSHIP, ALLEGHENY COUNTY, PENNSYLVANZA, ASSIGFNOR T0 TAYLOR-WILSON ItfIAlfl'UEACTURIHG GOMPANY, 0F LliIcKEES BUCKS, PENNSYLVANIA, A CORPQRATICFN OF PENNSYLVANIA.

THREADING MACHINE.

Application filed January 21, 1921.

To all whom it may concern:

Be it known that l, EDGAR H. VILSON, a citizen of the United States, residing at tlhartiers Township, in the county of Allegheny and State of Pennsylvania, have inrented a new and useful Improvement in Threading" Machines, of which the following is a full. clear, and exact description.

The present invention relates broadly to threading machines. and more particularly to machines adapted primarily for cutting threads on tubes and pipes. although it will be appreciated that its use in this respect is not limited.

An important object of the present invention is to provide a machine having a thread cutting device which is movable toward and from the periphery of the work being operated upon, and having means for automatically moving it to inoperative position after a thread of predetermined length has been cut, and also means for effecting such a movement at any period during the operation of the machine irrespective of the length of thread.

Another object of the present "ivention is to provide a novel control mechanism for a thread cutting machine of the character referred to.

Still another object of the invention is to provide a thread cutting machine having means tor cuttingoii sections of the work as may be required.

A further object of the invention is to provide a thread cutting die-operating mechanism which is readily adaptable to standard machines for rendering the operation thereof automatic.

A still further object of the invention is to provide a reamer for the threaded end of a pipe which forms a trip for the die-opening mechanism. and which is bodily removable to inoperative position to permit the operation oi the cutting oil means.

The foregoing and other objects, together with their attendant advantages, will be apparent as the invention becomes better understood. by reference to the accompanying specification and drawings forming a part thereof, it being premised that changes may be made in the various details and the manner of operation, within the scope of the appended claims, without departing from the spirit of the invention.

Serial No. 438,829.

Figure 1 is a side elevation of a machine constructed in accordance with the present inventlon l igure 2 is an end elevation of the machine illustrated in Figure 1;

Figure 3 is a top elevation. on an enlarged scale, of a portion of the die-opening mechanism;

Figure at is an end view of the construction illustrated in Figure 3;

Figure 5 is a side elevation partly broken away of the die-holding carriage;

Figure 6 is a view corresponding to Figure 5 illustrating the reamer moved to inoperative position;

Figure 7 is a detail view of the die;

Figure 8 is an end view of the reamer chuck;

Figures 9 and 10 are detail views of one of the controlling switches;

Figure 11 is a diagrammatic view of the solenoid circuits for operating the thread cutting die;

Figure 12 is a diagrammatic view of a fluid pressure operating mechanism for a pipe threading die; and

Figures 13 and 14% are detail views of valves for the fluid pressure system showing the same in their normal position.

it has heretofore been proposed to provide thread cutting machines having dies which are automatically moved to inoperative position after a thread of predetermined length has been cut on the pipe. Such machines have not, however. usually been provided with means for manually operating the dies at any desired time independently of the automatic. control. When cutting threads upon pipes or tubes having butt welded seams, such a manual operation is frequently desirable due to the opening of the seams under the action of the thread cu time die. The present invention aims to overcome the objections to machines which have heretofore been constructed and to provide acombined manual and automatic control for the thread cutting die.

I am also aware that it has been proposed to construct thread cutting machines in which a reamer was utilized for tripping certain mechanism and opening the thread cutting dies after a predetermined length of thread had been cut. With such machines, however, a manual setting 9i. the die operating mechanism has been required and the reamer has not been movable to a position permitting the operation of a cuttingoil means. The present. invention provides a reamer control without the objections which have heretofore existed in connection with such a control.

Referring more particularly to the draw ings:-There is illustrated in Figure 1 a pipe threading machine which may comprise any desired type of supporting base 2, having a head 3 within which may be journalled a barrel l aoapted to be driven by an electric motor or the like It will be understood that the barrel 4 carries any suitable mechanism, not shown, for gripping the work being operated upon. [is the gripping and rotating mechanism may be of any well known construction, the same is not illustrated in detail.

The base 2 of the machine is provided with the usual guideways 6 for the carriage 7 carrying the pipe threading, reaming and cutting otl mechanism. The carriage '2' may be formed with a rack 8 adapted to mesh with a gear i3 formed on the transversely extending shaft 10, which is adapted to be rotated to move the carriage longitudinally on the base by a hand wheel 11. In order that the carriage Y may he controlled from the head of the machine, there may be provided a second hand wheel 12 having a suitable drivii'ig connection 13 with the shaft 10.

According to the present invention, the thread cutting mechanism may comprise a hack plate l l, having a rectangular hollow extension 15 provided with a Ilanged .head l6 adapted to he slidahly engaged in guideways 17 formed in the front face of the carriage T, the carriage having an opening therein adapted to coincide with the opening 18 in the extension 15. Pivotally secured to the back plate 14 are the two sections 19 and 20 of a suitable die carrying the usual thread cutting chasing tools 20a. At their upper portions, each of the sections 19 and 20 is provided with a pin 21. projecting upwardly and adapted to be engaged by cam slots 22 in a horizontally rotatable disk 23. With this construction, it will be apparent that when the disk 23 is rotated in a clockwise direction, as viewed in Figure 3, the pins 21 will travel outwardly in the slots 22 and effect a movement of the thread cutting device away from the periphery of the work being operated upon, while rotation in the reverse direction will tend to move the thread cutting device into operative position. For efiecting suchrotat-ion, there is pivotally secured to the disk 23 a link 2e aving its opposite end connected to a crank arm 25 carried by a gear 26 rotatable on the vertical shaft 27. The shaft 27 may comprise a stub shaft suitably secured to the carriage 7 and projecting upwardly therefrom. Also, mounted on the upper portion of the carriage is a pair of solenoids 28, 29 with the openings therein in alignment to receive a three-part armature comprising cores 30 and 31 connected by a rack 32 of brass or other non-magnetic material, adapted to mesh with the gear 26.

Referring more particularly to Figure 11, the solenoid 28 is illustrated as having one of its winding terminals 33 connected to a line wire L, while the opposite terminal. 3%- is connected to a switch point 35. Cooperating with the switch point 35 and with a second point 36, having a connection with the line wire L, is a switch blade 37. In like manner, the solenoid 29 has one of its winding terminals 38 connected to the line wire L, while the opposite terminal 39 is connected to a contact point 40. Cooperating with the contact point a0 and a second contact point 41, electrically connected to the line wire L, is a switch blade 42. It will be apparent from this diagram that by closing either of the switches 37 or l2, the corresponding solenoid 28 or 29 will be energized and a movement, of the rack 32 etiected for closing or opening the die sections 19 and 20.

The manner of operating the switch 42, which controls the energizing of the solenoid 29 for moving the thread cutting device to inoperative position, will now be described in detail.

As shown more particularly in Figures 9 and 10., the switch blade 4.2 is carried by an arm 43 secured to a rock shaft ll journaled in a casing if), within which are mounted the contact points 420 and ll. On one end of the rock shaft is a counter-weighted arm it) normally adapted to maintain the switch blade out of circuit with the contacts. On the opposite end of the rock shaft is a depending arm 47 carrying a laterally projecting pin 4-8 adapted, during the operation of the machine, to lie between the shoulders of a grooved collar 49 adjustably mounted on the threaded stem 50 of the reamer chuck 51. The stem 50 is slidably mounted in a tubular bearing 52 secured to a sleeve 53 supported for longitudinal movement on a tubular supporting arm 54 carried by the carriage T and projecting rearwardly therefrom. 'l is reamer chuck 51 has a cylindrical bearing head 55 adapted to slide within the hollow extension 15 on the back plate 14 of the die carrier. For preventing rotation of the chuck, it may also be provided withv an elongated or rectangular head 56 adapted to engage the rectangular openin 57 in the head 16 of the extension 15. emovably mounted in the front end of the chuck is a reamer 58, the shank 59 of which is provided with pins 60 engaging slots 61 formed in the chuck for preventing relative movement of the parts.

llfl

neeaeee in Figures 5 and 6. During such time, the

reamer chuck is held-in its forward position by a pin 62 in the sleeve 53, which is moved downwardly into a vertically extending opening 63 in the support 54. After a thread of predetermined length has been cut on the ipe, it will engage the reamer and force t e same, together with its chuck, rearwardly against the action of a compression springfie on the stem 50. This movement of the stem will in turn bring one of the shoulders of the collar 49 into engagement with the pin 48 and will thereby rock the shaft 44. As soon as the counterweighted arm 46 passes its central position it it will have the effect of a snap actlon switch and immediately move the blade 42 into engagement with the contacts 40 and ll for energizing the solenoid 29 and opening the die sections. This snap action of the switch is permitted due to the lost motion connection provided between the shoulders of the collar l9. It will be apparent that by adjusting the position of the collar 49, the position of the reamer may be changed and the time of operation of the switch 42 correspondingly changed. In this manner the length of thread formed on the material before the automatic operation of the die may be varied.

it frequently happens, in working with butt welded pipes and tubes that the seam is opened or the work otherwise damaged. in such cases it is necessary to immediately open the die without waiting for the operation of the switch 42. Vith the present construction, such. an operation may be manually effected at any time during the operation of the machine. Referring more particularly to Figure 11, there is shown a switch 65 adapted to engage the contacts 66 and, (57, which are connected respectively to the terminal 39 of the solenoid 29 and to the line wire l/ in such manner as to form a shunt circuit around the switch 12. This switch 65 is preferably located in a suitable casing 68 on the head of the machine, as shown in Figure 1, whereby an operator positioned at this point may conveniently control the machine. The switch 37 for energizing the solenoid 28 may also be positioned in the casing 68, if desired.

After the manual operation of openin the die, it is ordinarily necessary to cut 0% a portion of the pipe or tube. To perform this operation without removing the work from the machine, the reamer 58 and its supporting chuck must be movable to inoperative position. In the present machine, this iseiiected by lifting the pin 62, sliding the sleeve 53 on the support 54 and then turning the sleeve 53 through substantially ninetydegrees to bring the pin 62 into registry with the horizontally extending opening 69 in the support. With the parts in this position, a cutter 70 movable in the transverse guides 71 in the rear of the carriage 7 by the handle 72, may effect the desired cutting ofl operation.

In some instances it may be desirable to control the operation of the die by 'fiuid pressure. A method of control by fluid pressure is illustrated diagrammatically in Figures 12 to it in which figures partscorresponding generally to the parts already described in detail are indicated by the same reference characters with the letter a afiixed thereto. With such a construction there may be provided cylinders 28 and 29 having pistons 30 and 31 therein for operating a rack 32 meshing with the die-operating pinion 26. Adjacent the rear face of the die may be located a three-way valve all, having an operating handle 43 adapted to be engaged by the work being operated upon and moved from its normal position shown in Figure 14,, to the position shown in Figure 12. This movement will bring the port 73 into engagement with a pressure supply line 74 and permit pressure to flow therefrom through the connection 75 into one end of the cylinder 76. This will etlect a movement of the piston 77 outwardly and ellect a movement of the four-way valve 65 from. the position shown in Figure 13, to the position shown in Figure 12. This movement of the valve 65 will move the port 78 out of communication between the pressure line 79 and the connection 80 leading to the cylinder 29 and bring the same into position to direct pressure from the line 79 into the pipe 81 tomove the piston in the cylinder 28 outwardly therein and open the die. This movement will move the port 82 out of exhaust position, as shown in Figure 13, for the pipe 81, and into exhaust position as shown in Figure 12, for the pipe 80. The valve 65 may be located on the head of the machine, in a position corresponding to the location of the casing 68, whereby it may be manually moved at any desired time by the handle 83 to efiect the desired movement of the die.

The advantages of the present invention arise from the provision of a control requiring no manual labor in setting or releasing the parts, although the operation may be manually controlled. Further advantages arise from the combined automatic lid and manual control enablin the dies to be advantageously operated as ound necessary.

Still further advantages arise from the construction of the parts permitting the reamer to be moved to inoperative position as found necessary.

Additional advantages of the present invention arise from the use of electrical means whereby rapidity of operation is insured, the die sections being moved practically concomitantly with the closing of the respective circuits.

Other practical advantages of the invention arise from the ease with which the machine is operated, no strenuous manual labor being required in opening and closing the die sections.

ll claim: I

l. A threading machine, comprising devices for gripping the work to be threaded,

a thread-cutting device movable toward and away from the periphery of the work, power means for operating said device, means for automatically controlling said means to move said cutting device away from the work after a thread oi predetermined length has been cut thereon, and means controlling said first mentioned means for moving said cutting die away from the work at any time during the operation of the machine, sub stantially as described.

2. A threading machine, comprising devices for gripping the work to be threaded, a thread-cutting device movable toward and away from the periphery of the Work, electrical means for autommica-lly moving said cutting device away from the work after a thread of predetermined length has been cut thereon, and electrical means con trolling said first mentioned means, for moving said cutting device toward or away from. the work at any time during the operation of the machine, substantially as described.

3. A threading machine, comprising means for gripping the work to be threaded, a threadcutting device movable toward and away from the periphery of the Work, a solenoid or automatically moving said cutting device away from the Work after a thread of predetermined length has been cut thereon, and a switch controlling said solenoid for moving the cutting device away from the work at any time during the operation of the machine, substantially as described.

l. A threading machine, comprising means for gripping and rotating the Work to be threaded, a thread-cutting device movable toward and away from the peri hery or the work, a solenoid for moving saic cutting device away from the work, a circuit closing device operated by the WOIl{ for energizing said solenoid to automatically move the cutting device away from the work after a thread or predetened length has been cut essence thereon, and a second circuit closing device for energizing said solenoid and moving said cuttin device away from the Work at, any time during the operation of the machine, substantially as described.

5. A threading machine, comprising means for gripping and rotating the Work to be threaded, a thread-cutting device movable toward and away from the periphery of the work, a solenoid for moving said cutting device away from the Work, and a plurality of independently operable circuit closing devices for said solenoid, substantially as described.

6. A threading machine, comprising means for gripping and rotating the work to be threaded, a thread-cutting device movable toward and away from the periphery of the work, a solenoid for moving said cutting device in one direction, a second solenoid for moving the cutting device in the other direction, and means for energizing said solenoids at will, substantially as described.

7. A threading machine, comprising means for gripping and rotating the work to be threaded, a sectional thread-cutting die, and electrically operated means for opening and closing said die sections. substantially as described.

8. A threading machine, comprising means for gripping and rotating the work to be threaded, an openable thread-cutting die, electrical means for openin and closing said die, and a plurality o independently operable controls for said electrical means, substantially as described.

9. A threading -machine, comprising means for gripping and rotating the work to be threaded, a-thread-cutting device comprising relativel movable sections, power means for moving said sections to operative and inoperative positions, and a plurality of independently operable controls for said last mentioned means, each capable of moving said sections to inoperative position, substantially as described.

10. A threading machine, comprising means for gripping the work to be threaded, an openable thread-cutting die, and electrically operated means for opening said cutting die at any time during the operation of the machine, substantially as de scribed.

11. A threading machine. comprising means for gripping and rotating the work to be threaded, an openable thread-cutting die, and oppositely acting solenoids for opening and closing said cutting die at any time during the operation of the machine, substantially as described.

12. A threading machine, comprising devices for gripping and rotating the work to be threaded, an openable thread-cutting die, power means for opening and closing said die, means for automatically con- Roll . menses trolling said means to open said die after a predetermined length of thread has been cut on said work, and means controlling said first mentioned means for opening said die at any time during the operation of the machine, substantially as described.

13. A threading machine, comprising means for gripping and rotating the work to be threaded, a movable thread-cuttin die, electrical means for moving said, die to operative and inoperative positions, a

reamer cooperating with said die and movable by the work being threaded, and a switch for said electrical means controlled by said reamer, substantially as described.

14:. A threading machine, comprising means for gripping and rotating the work to be threaded, a movable thread-cutting die, electrical means for moving said die to operative and inoperative positions, a reamer cooperating with said die and movable by the work being threaded, a switch for said electrical means controlled. by said reamer, and means for moving said reamer to inoperative position, substantially as described.

15. A thread cutting machine, comprising means for gripping the work to be threaded, a movable carriage cooperating with said means, a thread-cutting die on said carriage, a reamer on said carriage for automatically efiecting movement of said'die to inoperative position after a thread of predetermined length has been cut on the Work, and means for moving said reamer to inoperative position, substantially as described.

16. A thread-cutting machine, comprising means for gripping the work to be threaded, a movable carriage cooperating with said means, a thread-cutting die on said carriage, a reamer on said carriage for automatically efiecting movement of said die to inoperative-position after a thread of predetermined length has been cut on the work, means for moving said reamer to inoperative position, and a cutting-oil device operable in said carriage when said reamer has been moved to inoperative position, substantially as described. 7

17. A threading machine, comprising a thread-cutting die, rotatable means for moving said die to operative and inoperative positions, a pinion controlling said rotatable means, a rack co-operating with said pinion, and means for moving said rack in opposite directions, substantially as described.

18. A thread-cutting machine, comprising means for gripping and rotating the work to be threaded, a thread-cutting device movable into operative and inoperative positions with relation to said work, electrical means I controlling said die, a snap-action switch controlled by said Work-for automatically moving said die to inoperative position after a thread of predetermined length has been formed on the Work, and a second switch manually operable for moving said die to inoperative position at any time during the operation of said machine, substantially as described.

In testimony whereof, I have hereunto set my hand.

EDGAR H. WILSON. 

